docs: def versatile_options():
          """return list of options that can be changed at any time (not
          only be initialized), however the list might not be entirely up
          to date.
  
          The string ' #v ' in the default value indicates a 'versatile'
          option that can be changed any time.
  
          """
          return tuple(sorted(i[0] for i in list(CMAOptions.defaults().items()) if i[1].find(' #v ') > 0))